//算术运算符
/*
    public static void main(String[] args) {
        System.out.println(4+2);
        System.out.println(4-2);
        System.out.println(4*2);
        System.out.println(4/2);
        System.out.println(10/4);
        System.out.println(10.0/4);
        System.out.println((float)10/4);
        System.out.println((float)(10/4));
        System.out.println(10%4);
        System.out.println(-10%4);
        System.out.println(10%-4);
        System.out.println(10%4.5);
        System.out.println(11.5%4.5);
    }
*/